Mixing and stirring device



Jan. 1, 1935. A. SCHLIMBACH HIKING AND STIRRING DEVICE Filed NOV. 30,1931 UNITED STATES PATENT OFFICE MIXING AND STIRRING DEVICE AugustSchlimbach, Mainz-Kostheim, Germany,

assignor to Maschinenfabrik Augsburg-Numberg A. G., Nuremberg, Germany,a corporation of Germany Application November 30, 1931, Serial No.577,887 In Germany September 1 1931 3 Claims. (01. 2s9-9) My inventionrelates to a mixing and stirring so strongly that no floating mud canarise or device of the type in which a conveyor screw is continue toexist. used and which is intended especially for the The circumstancethat suspension members for treatment of rotten mud. It is known thatfor the guide body of the circulating conveying screw 5 accelerating theprocess of rotting in mud or are obviated can be utilized for providingin the 5 muddy water, it is not only necessary to mix free space abovethe outlet body of the riser a the precipitates continually anew withthe water device that prevents the escape of gas from the above them andto bring the substances in intireceptacle when the conveying screw shaftand mate contact with one another, but it is also its bearing body areremoved from out of the necessary to prevent the formation of floatingsame. l0 mud, as arises particularly easily in rotten mud This effect isattained, according to the present because of the many organicsubstances (fecal invention, by providing for said bearing bodysubstances) present therein. (which may be afllxed in the cover of there- While with only low depth of the muddy water -ceptacle or below thesame) a shell or jacket containing the rotten mud a mixing apparatuswhich extends from the cover downwardly to 15 having a conveying screwcausing the mud to below the upper surface of the muddy water circulatein vertical direction is sufficient, in containing the rotten mud, andwhich remains that, in view of the slight delivery'head, such an at itsplace when the conveying screw shaft and apparatus is capable ofbringing about the strong the bearing body for the same are removed,said surface motion requisite for the prevention of shell or jacketacting then as a closure by which 20 the enrichment of the rotten mudwith floating the escape of gas through the opening in the mud, this isno longer the case if the depth is cover, when the said shaft with thescrew ar comparatively great. 7 being removed, is effectively prevented.

- Now, the object of the present invention is to The invention isillustrated diagrammatically produce an apparatus of the type statedwhich and by way of example on the accompanying 25 will prevent veryeffectively the formation of drawing on which the new arrangement andfloating mud and the enrichment of the rotten combination of partsmentioned in the inmud therewith also in the case of great depth oftroductory part of this specification is shown the muddy water, andwhich is, besides, dispartly in vertical section and partly insidetinguished by its great simplicity. Its characterview, the upperfigure showing the main por- 30 istic features are these that a freelysuspended tion of said arrangement, etc., including the top shaft isprovided with two conveyor screws, of f h ri r, n h l w r figure howin hwhich the upper one rotates freely in the vessel lower end of rise! Withsome appertaining containing the muddy water a little below themembersupper surface of the same, whereas the lower on the drawing, 4denotes the mixing p- 35 conveying screw is located in a guide body thattecle and d is the rise! which is po d by forms the outlet end of avertical or practically feet b (lower figure) and d i place by p rvertical riser extending freely upwardly in said stays 0 (upperfigure),these letter members being water o mud, connected with theoutlet body 12 of the riser.

This arrangement and combination of p rt In the embodiment shown, theriser has a slight presents the advantage that the space above theoblique position, but it may as well be completely riser through whichextend, with the known Vertieel- The Outlet b y (11 u ds a usualarrangement of said guide body. for the veil and Circulating ew 1 whichis afllxed lower or circulating conveying screw, the supto a shortvertical suspension shaft e on which is porting rods, as well as (in thecase of the prou d a second Conveying and distributing vision of aseparate guide member for the conw'f this screw being located above said011tveying screw shaft) the holding members of e y the guide bearing,remains free for the complete- Q denotes the bearing d fer the shaft 6 5ly undisturbed action and utilization of the stir- Which body extendsfrom the cover 01 0f the ring effect of the upper screw. ceptacle downto below the upper surface of the The rotten mud conveyed to the upperscrew muddy water and is enclosed in a jacket or shell by the lower oneis freely distributed by the h which also extends down to below saidsurface. upper screw to all sides, without any impedi- This jacket orshell is secured to the cover of ment, whereby the surface of the mud isagitated the receptacle so that it remains in its Place when 55containing substances some of which tend to sink in the liquid andothers of which tend to collect 'andfioat on the surface of the liquid,said device comprising a relatively deep receptacle to be filled to alevel near the top thereof with the liquid, a riser within thereceptacle having its lower end open and disposed adjacent to the bottomof the receptacle and having its upper end open and disposed adjacent tothe top of the receptacle and below but near the surface of the liquid.a screw propeller within said riser to produce a circulation of theliquid and contained substances from the bottom of the receptacleupwardly through the riser, and means separate from said screw propellerspaced thereabove and disposed near the top of the receptacle above theupper end of the riser and adjacent to and below the surface of theliquid to produce a strong surface fiow of the liquid and the substanceselevated by the first mentioned mens laterally away from the locationwhere the substances are caused to rise near the surface of the liquidby said first mentioned means, thereby to prevent the accumulation of alayer of floating material on the surface of the liquid.

2. A device especially designed for mixing and stirring rotten mudcomprising, in combination, a closed receptacle of considerable depth tobe substantially filled with the material to be treated, a riser withinthe receptacle having its lower end open and disposed adjacent to thebottom of 1,986,606 the body or is withdrawn together with the shaft thereceptacle and having its upper guide-forming end open and. disposedadjacent to the top of the receptacle and below but near the surface ofthe material to be treated, the distance between the surface of thematerial and the upper end of said riser being considerably less thanthe distance between the top of said riser and the bottom of thereceptacle, a screw propeller within the upper end portion of said riserfor effecting an upward circulation of the material through said riser,and a second screw propeller separate from and spaced above said firstmentioned screw propeller and above the upper end of said riser andbelow the surface of the material to intimately mix and distribute thematerial in a lateral direction thereby preventing the formation of amud layer on the surface of the material.

3. A mixing and stirring device comprising, in combination, a receptaclefor the material to be treated, a cover for the receptacle, a shellextending from the cover downwardly below the surface of the materialwithin the receptacle, a shaft bearing body removably mounted withinsaid shell and coacting with the inside of the wall of said shell, ashaft journaled in said hearing body and extending below said shell, ariser within the receptacle having an open upper end disposed below thelower end of the shell and in alinement therewith, and a pair of screwpropellers on said shaft one disposed within the upper end portion ofthe riser and the other disposed between the upper end of the riser andthe lower end of the shell.

AUGUST SCHLIMBACH.

